Means for regulating the temperature of rolls



J. G. MAXWELL.

MEANS FOR REGULAHNG THE TEMPERATURE OF ROLLS. APPLICATION mm mm. 25. I920.

1Q66,581 Patented Jan. 25, 1921.

- INVENTOR ATTORNEY JAMES G. MAXWELL. OF CLEVELAND. OHIO.

MEANS FOB REGULATING THE TEMPERATURE OF ROLLS.

Specification of Letters Patent.

Patented Jan. 25, 1921.

Application filed March 25. 1920. Serial No. 368,550.

T 0 all whom it may concern:

Be it known that I. JAMns G. MAxwELL, a citizen of the United States, and resident of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Means for Regulating the Temperature of Rolls. of which I herebydeclare the following to be a full, clear, and exact description, such as will enable others skilled in the art to which it a pertains to make and use the same.

he objects of this invention are to provide means for maintaining the temperature of a pair of rolls at an approximately uniform degree throughout the entire time that the rolls are in operation, which ma) be rolonged for an entire week.

he rolls in a sheet metal rolling or jobbing mill are sometimes too cold when the metal bars which leave the furnace in a heated condition are passed through them. and the difference in the temperature of the rolls and bar is often so great at the initial stage of rolling the metal that there is danger of cracking the rolls on account of the too sudden and unequal expansion thereof when the hot bars pass between them: also after continual use the rolls become so heated on the surface that they will pick up the scale that leaves the bars and will acquire a rough surface thereby, and will impress their roughened surfaces upon the finished sheets.

To overcome these tendencies and conditions, the temperature of the rolls is maintained substantially uniform durin their operation by means, first, of th a i ti of hot steam to the rolls at or near their adjacent surfaces or centers of contact. which raises their temperature sufficiently to prepare them for receiving the passes of hot metal without injury to the rolls; and second, by means of application of a combined air and steam blast untilthe rolls become heated enough to expand in the middle more than at their extremities, when an air blast alone is applied to prevent further ex pension of the rolls. And the blast of steam and air. or air. iscontrolled in such a manner as to prevent any change in'the shape of the rolls while they are in use, by means of suitable supply pipes for. steam and air and valves to-regulate-the passage therethrough.

The 'inventionincludes a hollow foreplate r manifold havingan outlet'opening or o )enings in the transverse edge adjacent to t e rolls, and this opening is preferably larger at the center of the rolls, to admit more steam and air. or air or steam along at the center of the rolls. where the amount of expansion of the rolls is greatest. and the opening is gradually reduced from the center of the fore plate in the direction of its extremities and the outer edges of the fore plate.

Through this openin; the steam and air under pressure are uniformly distributed over both rolls. thus uniform]; heating or cooiin; them :H't'tbltlllUj to the cilia-ts desired.

ll thus maintaining a low and uniform temperature throughout the rolls the sheets are more smoothly finished and the amount of roll breakage is considerably reduced.

The invention is hereinafter more fully described, illustrated in the accompanying drawings and specifically pointed out in the claims.

In the accompanying drawings Figure 1 is a transverse section of a pair of rolls and a hollow fore plate, showing the mode of application of steam and air blasts alternately or simultaneously. thereto. l ig. 2, is a perspective of the fore plate, showing the opening in the front edge thereof. F ig. 3 is an elevation of the inner edge of a modified form of fore plate.

In these views, A. and A are upper and lower rolls of a pair of rolls ada ted for rolling tin or other metal sheets. is the fore plate which is provided with the in ternal cavity or chamber C, having an outlet, 7

or outlet openings D, D, in its front edge.

This opening is lar est at the center of this edge and is pre erably gradually reduced at the side edges of the plate but may be largest at its extremities and extends substantially the entire width of the aforesaid front edge as shown in Fig. 3, at B, D. At E is shown -a supply pipe for steam, leadingto the chamber, G, which is con trolled by means of the valve F. At G is shown a supply pipe for air, leading to the chamber C, which is controlled by means of the valve'H.

These valves can be separately opened and closed so that either steam or air or a predetermined blast of commingled steam and air, can be employed, 'the use of which is determined by the temperature and conditions of the rolls.

By proper manipulation of the blasts of steam and air the rolls can be maintained at a normal degree of term erature, and the shape can be maintaine without change during the entire use of the rolls, however prolonged it may be.

By utilizing thisprocess it is possible to immediately roll the full .width of metal sheets for which therolls were designed The present practice necessitates first rolling narrower sheets than are desired and then gradually bringin the rolls to proper shape by ex ansion after repeated use, to receive the ull Width of sheets for which the rolls were originally designed.

Having described the invention what we claim as new and desire to secure by Letters Patent is:

1 In an appliance for maintaining a uniform degree of temperature in a pair of rolls, the combination with said rolls. of independently controlled supply pipes for steam and air respectix'ely, and a common chamber into which said pipes discharge, said chamber provided with an elongated discharge opening adjacent to the contacting surfaces, of said rolls.

2. In an appliance for maintaining a uniform degree of temperature in a pair of rolls, the combination with said rolls of independently controlled supply pipes for steam and air respectively, and a common chamber into which said pipes discharge, said chamber provided with an elongated discharge opening adjacent to the contacting surfaces of said rolls, said elon ated dischar e openin bein largest at the center an gradua lly re uced toward its extremities, for the purpose described.

3. The combination with a pair of rolls, of a hollow fore plate therefor, the cavity in said fore plate having an opening extending through the front edge of said )late, ad aCent to the contacting surfaces ot said rolls, and means for independently introducing steam and air under pressure into said cavity in said fore plate.

4. The combination with a pair of rolls,

of a hollow fore plate therefor, the cavity in said fore plate having an opening extending through the front edge of said plate, adjacent to the contacting surfaces of said rolls. and means for independently introducing steam and air under pressure into said cavity in said fore plate, and separate means for controlling the passage of steam and air to said cavity.

In testimony whereof I hereunto set my hand this 26th day of Februarv. 1920.

JAMES G. MAXWELL.

In presence of CHAS F. SIPE, Var. M. Monroe. 

